This will be a single site, prospective, community-randomized trial to study the effectiveness for two TB prevention strategies on the community incidence of TB: DOTS versus Enhanced DOTS (DOTS-Ampliado, or DOTS-A). DOTS-A will add intensive screening of household contacts of active TB cases and the provision of TB treatment or prophylaxis as needed to the standard DOTS regimen. Adult contacts in the DOTS-A communities will be offered enrollment into a randomized clinical trial comparing rifapentine/isoniazid preventive therapy to rifampin/pyrazinamide. Subjects will be recruited from TB cases identified for treatment at the Health Clinics of eight urban communities. These communities will be matched and randomly assigned to receive either DOTS or DOTS-A strategy. The change in the incidence of TB in the two groups of communities will be measured after a 4-year period to determine whether DOTS-A strategy significantly reduces the incidence of TB compared to DOTS alone.